Display Device, Manufacturing Method Thereof, and Manufacturing Apparatus Thereof

7. The method of claim 1, wherein the step of coupling the first display panel and the first window comprises bonding them together and the coupled position is a bonding position, and the first display panel and the first window are provided in a K number, and the bonding position is defined as the average bonding position of K bonding positions measured when the K first display panels and the K first windows are bonded K times, and K is a natural number greater than 2.

8. The method of claim 1, wherein when viewed in a plan view, the first indicia, the second indicia, and the third indicia do not overlap each other, and the third indicia is disposed at an outer periphery spaced apart from an edge of the first display panel.

9. The method of claim 1, wherein the first, second, and third indicia comprises first mark, second mark, and third marks, respectively, having different shapes.

12. The method of claim 11, wherein the second indicia is disposed at a level lower in the display device than the first indicia.

13. The method of claim 11, wherein the first indicia and the second indicia comprise first and second marks formed in an embossed pattern.

15. The method of claim 14, wherein the third indicia comprises a third mark formed in an engraved pattern on the print layer.

16. The method of claim 1, wherein first edge portions defined by both sides of the first display panel and second edge portions defined by both sides of the first window are generally curved, the first indicia and the second indicia do not overlap the first edge portions, and the third indicia does not overlap the second edge portions.